Work

Radial and Angular Rotons in Trapped Dipolar Gases

Year: 2007

Type: article

Abstract: We study Bose-Einstein condensates with purely dipolar interactions in oblate traps. We find that the condensate always becomes unstable to collapse when the number of particles is sufficiently large. We analyze the instability, and find that it is the trapped-gas analogue of the "roton-maxon" instability previously reported for a gas that is unconfined in 2D. In addition, we find that under certain circumstances the condensate wave function attains a biconcave shape, with its maximum density away from the center of the gas. These biconcave condensates become unstable due to azimuthal excitation--an angular roton.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.98.030406

Authors: Shai Ronen, Daniele C. E. Bortolotti, John L. Bohn

Institutions: Joint Institute for Laboratory Astrophysics, University of Colorado Boulder, European Laboratory for Non-Linear Spectroscopy, University of Florence

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2021758396

FWCI: 14.03

Cites: 27

Cited by: 243

Related to: 10